
Claude Opus 5.5 is Anthropic's newest Opus model (released September 22, 2026) and the one Anthropic recommends as the default for most work. According to Anthropic, it comes close to Claude Fable 5.1 on most tasks while producing output faster and using fewer tokens per task than Claude Opus 5 — strong at agentic coding, complex reasoning and professional knowledge work.
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